Projection apparatus and centrallized control system therefor



Jan. 28, 1941. 2,229,761

PROJECTION APPARATUS AND GENTRALIZED CONTROL SYSTEM THEREFOR A. MUELLER 5 Sheets-Sheet 1 Filed March 18, 1938 IN VE NTO R A/ber'f B. Mueller J 1941- A. B. MUELLER 4 2,229,761

PROJECTION APPARATUS AND CENTRALIZEDCONTROL SYSTEM THEREFOR Filed March 18, 1938 5 Sheets-Sheet 2 R INVENTOR Alba/'2 B. Mue//er W M s M ATTORNEYIJ| Jan. 28, 1941. A. B. MUELLER PROJECTION APPARATUS AND CENTRALIZED CONTROL SYSTEM THEREFOR Filed March 18, 1938 5 Sheets-Sheet 3 I INVENTOR 14/176/"7 B. Mueller BY W, wamQ ATTO R N EYJ' Jan. 28, 1941. a MUELLER 2,229,761

PROJECTION APPARATUS AND CENTRALIZED CONTROL SYSTEM THEREFOR INVENTOR I Alba/"f5. Mue/ler BY I M Ma

ATTO R N EYJ' Jan. 28, 1941. MU 2,229,761

PROJECTION APPARATUS AND CENTRALIZED CONTROL SYSTEM THEREFOR Filed March 18, 1938 5 Sheets-Sheet 5 I II INVENTOR Alberf B. Mueller a? M ATTO N TZYs HllilllllllHU Patented Jan. 28, 1941 I PROJECTION APPARATUS AND CENTRAL- IZED CONTROL SYSTEM THEREFOR Albert B. Mueller, Clifton, N. J assignor to General Printing Ink corpo w rk, N. Y-, a corporation of Delaware Application March 18, 1938, Serial No. 196,602

10 Claims. (CI. 88-24) My invention relates to a projection appara- Fig. 11 is an elevational view, partly in sectus and, more particularly, my invention has tlon, showing the operating device of Fig. 10. reference to a control system for effecting de- As shown on the drawings, the projection apsired adjustments of such apparatus. paratus of my invention comprises a plurality My invention, in an important phase thereof, of open frames I utilizable for supporting purrelates to a projection apparatus having variposes, four of these frames I being alined lonous control devices which are grouped for congitudinally at each side of the machine and said venient manual Operation adjacent the zone 00- frames I being alined in pairs transversely of the cupied by the sensitized surface of said projecmachine. Suspended from the top section of ti apparatus, each frame I is a spring structure 2 and each 10 Further, my invention relates to various novel pair of these transversely alined sp strucdevices for effecting desired adjustments as retures 2 carries a transverse member 3. These gards parts of the optical system, transverse members 3 support a longitudinally Various other objects, advantages and charextending fra e formed from four tubes or rods acteristics of my invention will become apparent 80 positioned that they fo m upper and lower 5 from the following detailed description: pairs, all of said tubes 4 being disposed in par- My invention resides in the projection appa- 8.1181 relation and the tubes 4 Of each pair beratus, centralized control arrangement, combimg horizontally al n d- These tubes 4 are nations and arrangements of the character heremaintained in fixed rm ng relation by inafter described and claimed, transversely extending structures 5 disposed in 20 For an understanding f my invention and parallel relation with respect to each other. for an illustration of one of the forms thereof,- Disposed above the frame formed by the tubes reference is to be had to the accompanying drawa carriage 5, which, at each S de thereof, caringsy in which; ries a plurality of wheels or rollers I engageable,

Figure 1 is a side elevational view of a projec- P f with the upper of tubes 1 25 tion apparatus as constructed in accordance whlc as clearly apPears t Serve as with my invention, a trackway along which said carriage 6 is movble Fig. 2 1s a diagrammatic perspective view, with In accordance with the invention, the carriage ggg of the arrangement shown 6 is controlled for to-and-fro movement in a 30 novel manner. To this end, as shown in Figs.

2 and 8, a shaft 8 is horizontally mounted on a bracket 8a and in one side of a housing 9 upstanding from and secured to that structure 5 at the left, Fig; 1, said shaft 8 having a sprockt i th et wheel I0 rotatable therewith. Disposed in 0 5 e f 1 rt] alinement, longitudinally of the machine, with 1 1s ransverse 1on9 pa y this sprocket wheel I0 is a second sprocket wheel 9 taken 9 the 11m f 1 11, Figs. 2, 11 and 12, which has its hub Ila a 6 i f iggfig gggi igg z View secured to and fgtatable with a sleeve l2, Fig. 40

- 12, this sleeve being journalled in a bearirosgitrarzrss. mess: by to r 3 that transverse s me we at the right, Fig. 1, Fig. is a transverse vertical sectional view, and said sleeve z having Secured to one end liialrtlilrK 1n elevaglorgtakten on lin of thereof, as by a set screw H, the hub l5a of a 45 00 mg m 8 H80 1011 o o s; hand wheel I 5. Coactable with the sprocket 8 is a transverse vertical sectional view, wheels l0 and I l is an endless sprocket chain P y in elevation. taken on the line P3 of l3 which, in suitable manner, for example, as in- Fig. 3 is a transverse vertical sectional view, partly in elevation, taken on the line 3-3 of Fig. 1 looking in the direction of the arrows;

Fig. 4 is a plan view, partly in section, taken on the line 4-4 of Fig. 1 looking in the direc- 1 looking in e d ect o of t e w dicated at M, Fig. 2, is anchored to the afore- Fig. 9 is a vertical sectional view, partly in aid carriage 6, 50 elevation, showing a form of locking mecha- As clearly illustrated in Figs. 1, 2 and '1, the nism; aforesaid carriage 8 is of such character that Fig. 10 is a plan view showing a mechanical the upper surface thereof forms a pair of spaced operating device as constructed in accordance tracks 6a, 6a with which coact the respective 5a with my invention; and sets of wheels l5 suitably journalled in the lower 5 housing I6 of an arc lamp which is received in an upper housing ii. This are lamp may be of any well known type. It comprises suitable mechanism controlled by an actuating handle I8 for positioning the positive carbon, other mechanism controlled by an actuating handle I9 for positioning the positive and negative carbons, other mechanism controlled by a hand wheel 20 for swinging the lamp house, etc.

In accordance with the invention, the arc lamp housing structure I6, I! is controlled for toand-fro movement in a novel manner. To this end, as shown in Fig. 8, a shaft 23 is horizontally mounted on a bracket 23a and on one side of the aforesaid housing 9, said shaft 23 having a sprocket wheel 24 rotatable therewith. Disposed in alinement, longitudinally of the machine, with the sprocket wheel 24 is another sprocket wheel 25, Figs. 2, 11 and 12, which has its hub 25a secured to and rotatable with a shaft 26, one end of which is journalled in a bearing formed by a bearing bracket 21 secured to that .transverse structure 5 at the right, Fig. 1, the other end of said shaft 26 being journalled in the aforesaid sleeve I2. At its end removed from the bracket 21, the shaft 26 has secured thereto the hub 28a of a hand wheel 28, Fig. 12. Coactable with the sprocket Wheels 24 and 25 is a sprocket chain 24a which, in suitable manner, for example, as indicated at 24b, Fig. 2, is anchored to the aforesaid lower housing I6 of the arc lamp structure.

The shaft 26, at the end thereof to which the hand wheel 28 is'secured, is provided with a longitudinally extending passage which is internally threaded to receive a threaded shank 29 to which, at the end thereof to the left, a hand wheel 30 is secured. At its opposite end, the shank 29 comprises a conical surface 29a coactable with the inner ends of a plurality of dogs 3| having their outer ends received, respectively, in passages formed in the respective shoes 32 which are coactable with the aforesaid hub I5a of the hand wheel I5. As will be understood, when the hand wheel 30 is rotated to a sufflcient extent in the proper direction, the dogs 3| cause the shoes 32 to frictionally engage the hub I 511 of the hand wheel I5 whereby the shaft 26 is releasably locked to the sleeve I2 for the useful purpose hereinafter to be described.

The above described sleeve I2 has secured thereto a collar 33 with which is coactable a screw shank 34 having a handle 35, said screw shank 34 being threaded through a lug I3a extending laterally from the aforesaid bearing bracket I3.

Further, the sleeve I2 has secured thereto another collar 36 having inscribed thereon a scale 31 which is cooperative with an index 38 marked on a member 39 secured to the aforesaid bracket I3, Fig. 11.

Still further, the sleeve I2 has secured thereto a hub 310 which carries a gear wheel 380 meshing with a gear wheel 39c mounted on a shaft which carries another gear wheel 40, the gear wheels 39c and 40 being connected together for movement as a unit. The gear wheel 40 meshes with and drives a gear wheel 4| which operates suitable counter mechanism 42 provided for the purpose hereinafter described.

The aforesaid shaft 26 has secured thereto a collar 43 which has inscribed thereon a scale 44 cooperative with an index 45 marked on a memllxir 46 secured to the aforesaid bracket 41, Fig.

Further, the shaft 26 has secured thereto a hub 48 which carries a gear wheel 49 disposed in meshing relation with respect to a gear wheel 50 mounted on a shaft which carries another gear wheel iii, the gear wheels 50 and 5I being connected together for movement as a unit. The gear wheel 5I meshes with and drives a gear wheel 52 which operates suitable counter mechanism 53 provided for the purpose hereinafter described.

Referring to Figs. 3, 11 and 12, one end of a shaft 54 of rectangular or other polygonal configuration is shown as mounted in a bearing formed by a bracket 55 suitably secured to one of the aforesaid structures 5, the other end of said shaft being mounted in a suitable fixed bearing, for example, as shown in Fig, 2. One end of this shaft 54 has a hand Wheel 56 secured thereto and this same end of the shaft carries a collar 51 having inscribed thereon a scale 58 which is cooperative with an index 59 marked on a member 60 secured to the aforesaid bracket 55.

The shaft 54 carries a second collar 6I with which coacts one end of a shaft 62 threaded in a section 63 extending laterally from the aforesaid bearing bracket 55, said shaft 62 having an actuating handle 62a secured thereto and projecting therefrom.

Further, the shaft 54 carries a gear wheel 64 which meshes with and drives a gear wheel 65 utilizable for operating suitable counter mechanism 66 provided for the purpose hereinafter described.

As illustrated in Figs. 4, 11 and 12, a housing 61 generally angular in cross-section and formed from sheet material is secured in fixed position so that it extends longitudinally of the sleeve I2 and shaft 26, the top section of this housing 61 overlying the above described operating devices for the respective counter mechanisms and said housing top section comprising openings 61a through which the counter mechanisms per se may be observed.

Referring to Fig. 3, the end of the square shaft 54 opposite the aforesaid hand wheel 56 has a gear wheel 68 freely slidable thereon, this sliding movement occurring because said gear wheel 68 is movable with a housing 68a. depending from and carried by the forward end of the aforesaid carriage 61 The gear wheel 68 is engaged by and drives a sprocket chain 69 maintained under tension by suitable pivoted chain-tightening mechanism 69 Fig. 3. The sprocket chain 69 in turn, drives a ear wheel I secured to and rotatable with a worm II mounted for rotatable movement in bearings I2 projecting upwardly from and secured to the carriage 6, Fig. 4.

Slidable on the aforesaid tracks 6a, 6a of the carriage 6 is a support I3 having extending upwardly therefrom a pair of spaced standards I4 utilizable as hereinafter described for supporting the objective lens of the herein described projection apparatus. Upstanding from the support I3 are a pair of spaced bearing blocks I rotatably supporting a shaft I6 which extends horizontally through a bearing formed in one of the standards I4. Directly above the aforesaid worm II, the shaft I6 carries a worm wheel H which meshes with said worm II. At its end beyond the last named standard I4, the shaft I6 carries a hand wheel I8 and a locking wheel I9 having notches 19a with which is coacted a latch adapted to be locked in position by a 7 wheel 800, said latch 80 being mounted in a housing 8| slidably carried by a member 82 suitably supported by said last named standard 14. Associated with the housing 8| is a member 88 utilizable for operating a cam, not shown, to raise and lower said housing 8|. As shown in Fig. 3,

a pointer 89a carried by the support 19 coacts' which has its front end secured to the frame 84.

and which has its rear end secured to an upstanding frame 81 suitably anchored to the aforesaid carriage 6, as by the bolts 88, Fig. 5.

Projecting laterally from the lower section of the frame 81 are the rollers 89 which support an assembly 90 for horizontal movement, this assembly 90 comprising a vertical plate 9| which rests directly upon said rollers 89 and which is maintained in a vertical plane for horizontal sliding movement by lower retaining members 89a and upper retaining members, not shown, all of said retaining members being carried by said frame 81. The plate 9| carries a pair of spaced depending brackets 92, these brackets forming bearings for a shaft 93 carrying an actuating handle 93a, the shaft 93 being threaded through an internally threaded nut device 94 flxed to said frame 81. Accordingly, by rotation of the handle 93a, the assembly 90 may be moved horizontally in one direction or the other with respect to the frame 81, and the extent of this movement may be determined by observing a cooperating pointer and scale carried by the respective members 95, 96 secured, respectively, to the plate 9| and to the frame 81.

Forming a part of the assembly 90 and slidable on the plate 9| is a plate 91 which is guided for vertical movement in any suitable manner, as by cooperating blocks and standards, not shown. Journalled in the plate 9| is the shaft for an actuating handle 98, Fig. 5, which, by suitable gear mechanism, operates a shaft 99, Fig. 1, this shaft controlling suitable chains, or equivalent, for imparting vertical movement to said plate 91. Accordingly, by rotation of the handle 98, the plate 91 may be moved vertically in one direction or the other and the extent of this movement may be determined by observing a cooperating pointer and scale carried by the respective members I00, IOI secured, respectively, to the plates 91 and 9|.

As indicated on the drawings, chains I02 are secured to the plate 91 and these chains extend over the respective rollers I09 so as to support suitable weights, not shown, utilizable for counter-balancing the plate 91 and the parts carried thereby.

Projecting laterally from the plate 91 are the upper and lower sets of rollers I03 which slidably support, for horizontal movement, a plate I04 which, in turn, carries a plurality of laterally extending rollers I05 utilizable for rotatably supporting a plate I08 to which, in suitable manner, is detachably secured a frame I01 adapted, by means comprising the clamps I08, to detachably support a printing plate I09.

In a detailed manner above, I have described a manually operable arrangement utilizable for moving the carriage 6 in a desired manner. If

desired, supplementary carriage-movingmeans may be employed and, as shown in Figs. 1, 2 and 5, this means last named may comprise a fixed rack IIO which extends horizontally in a direction parallel with respect to the aforesaid tubes 4, this rack [I having cooperable therewith a gear wheel I II which is secured to and rotatable with a shaft 2 mounted in bearings associated with the carriage 6, this shaft II2, exteriorly of said carriage 6, having an operating wheel II3 secured thereto.

Referring to Figs. 1 and 6, the aforesaid tracks 6a, 6a of the carriage 6 are shown as supporting a base member II4 which, in turn, supports a housing II5 to the upper surface of which is secured a fixed housing I I6 having a movable housin I I1 pivoted thereto, these two housings forming the enclosure for the condenser lens assembly of the projection apparatus, the condenser lens assembly being of any suitable character and the front condenser lens being shown at I I8 in Fig. 6.

Referring to Fig. 1, a shaft H9 is shown as mounted in a bearing I20 upstanding from the carriage 6, this shaft II9 having an actuating wheel II9a, and said shaft II9 being threaded into the aforesaid base member II4 of the condenser lens assembly. Accordingly, rotation of the wheel II9a in one direction or the other results in the production of desired movement of the condenser lens assembly along and with respect to the carriage 6.

In order that the condenser lens assembly may be maintained in an adjusted position as desired, there may be provided an arrangement such as illustrated in Fig. 9, for example, wherein to a transverse section such as a rib II4a of the condenser lens base member II4, there is suitably secured, as by the screws I2I, an angle member I22 having a horizontal section I22a provided with an elongated slot I22b. Slidable along this slot I22b is a headed pin I23 secured to and utilizable for supporting a block I24. The slot I22b also receives, in freely slidable relation, a pair of headed pins I25 which support the upper horizontal section of an angle member I26 which has a vertical section corresponding generally with the block I24 and disposed in parallel relation with respect thereto. A suitably journalled shaft I21 carryin an actuating Wheel I28 extends through horizontally alined openings formed in the block I24 and the vertical section of the member I26, the opening through the block I24 freely receiving the shaft I21 and the opening through the vertical section of the member I26 being threaded so as to coact with threads formed on the end of said shaft I21. Further, the shaft I21 has a collar I29 pinned or otherwise secured thereto, this collar coacting with the aforesaid block I24.

Extending longitudinally above the upper section of the carriage 6 and suitably secured thereto is a bar I30 with which the aforesaid block I24 and vertical section of the member I26 are adapted to coact. Thus, as clearly appears from a consideration of Fig. 9, the shaft I21 may be rotated, after the condenser lens base member II4 has been positioned as desired, in the proper direction to cause the threaded end thereof to move from left to right, Fig. 9. This action causes the vertical section of said member I26 and the block I24 to move into clamping relation with respect to the bar I30 with the result that the condenser lens base member I I4 and associated parts are positively retained in the desired position on the carriage 5. Further, as will be Y lamp structure.

understood, theabove described clamping action occurs in an equalizing manner with the attendant advantages.

In Fig.1, I have shown an operating wheel I3l, corresponding with the above noted wheel I28, associated with the lower housing I6 of the are This wheel I3I, the same as the wheel I 28, may control mechanism similar to that shown in Fig. 9 for positively locking the arc lamp arrangement in a desired position on the carriage 6.

- Further in Fig. l, I have shown an operating wheel I32 corresponding with the above noted wheels -I28 and I3I. This wheel I32 may control' mechanism similar to that shown in Fig. 9 for causing the carriage 6 to be positively locked in a desired position.

As shown in Fig. l, the lower pair of the aforesaid tubes 4 extend a substantial distance to the right beyond the upper pair of said tubes 4. In this position, said lower pair of tubes 4 have secured thereto a support I33 which carries an upstanding frame disposed between a pair of spaced, vertical posts I 34. Each of said last named tubes 4, at its extreme end, carries an upstanding bracket I35 and each bracket I 35 has a guy member I36 secured thereto, these guy members being secured to the aforesaid frame.

The frame last described is provided with bearings for a pair of spaced vertical jack screws I31, Fig. 2, and this frame also has secured thereto a shaft I 38 provided at its respective opposite ends with bevel gears I39 which mesh with the respective bevel gears I40 carried by the jack screws I31, respectively. The shaft I38 has secured thereto a centrally disposed gear wheel I H which meshes with a gear wheel I42 secured to one end of a shaft I43, the other end of which has a pair of pulleys I44, I45 secured thereto. Coactable with the pulley I 44 is an endless belt I46 which coacts with a second pulley I41 secured to one end of a shaft I48, the other end of which has an operating hand wheel I 49 secured thereto. Coactable with the pulley I45 is an endless belt I50 which coacts with a second pulley I5I carried by one end of a shaft I52, the other end of which has an operating hand Wheel I53 secured thereto. It shall be understood that the shafts I43, I48, I52 and associated parts are all secured to the aforesaid frame or otherwise mounted in fixed position.

Guided for vertical movement in any suitable manner is a vertical plate I54 which, on the rear face thereof, carries a pair of nut members I55 internally threaded so as to coact with the jack screws I31, respectively. Suitably guided for horizontal movement on the plate I54 is a vertical plate I56 which has secured thereto a bracket arm I51 terminating in a lower tubular section internally threaded for the reception of a suitably supported horizontal shaft I58 having a gear wheel I59 secured to one end thereof, this gear wheel meshing with a gear wheel I60 secured to one end of a suitably supported horizontal shaft I 6| which carries a worm wheel I62 with which meshes a worm I62a having extending therefrom a shaft which carries an operating hand wheel I62b. In connection with the mechanism last described, it will be understood that the shafts I58, I6I and associated mechanism move in either direction vertically in correspondence with movement of the plate I54.

The plate I56, or equivalent, is adapted to have secured thereto in suitable manner a sensitized surface or press plate which faces the objective lens so as to receive thereon a latent image of the representation appearing on the aforesaid negative plate I09. After this press plate has been secured to the plate I56, horizontal adjustment thereof may be effected as desired by manipulation of the hand wheel I621). Further, such vertical adjustment as desired may be obtained by manipulating either the hand wheel I49 or the hand wheel I53.

The description of this application having reference to the arrangement secured to the lower pair of tubes 4 for supporting and adjusting the position of the press plate or sensitized surface is couched in general terms. It shall be understood that such an arrangement as thus generally described may be employed, or that any other equivalent or suitable press plate supporting and adjusting arrangement may be utilized as desired.

A shown in Fig. 1, there is a space between the press plate supporting structure and the adjacent end of the upper set of tubes 4. In this space, there may be disposed a bench I63 or the like, this bench extending transversely of the mechanism in convenient location for the use of the operator.

In operation, it will be understood that a press plate is securedto the plate I56 in such suitable manner that the sensitized surface thereof faces the front face of the objective lens 85. It will also be understood that a printing plate I09 is secured to the frame I01, or equivalent, in suitable manner, for example, as indicated.

By manipulation of the various hand wheels I49, I53 and "5% the plate I56 on which the press plate is directly supported may be moved as desired eithenhorizontally or vertically so as to position said press plate as desired with respect to the projection axis of the optical sys- By manipulation of the various handles 93a and 98, Fig. 5, horizontal and vertical movement may be imparted, respectively, to the frame I01, or equivalent, which directly supports the print ing plate I 09 whereby the latter is suitably located with respect to said optical axis.

Assuming that the hand wheel 30 is in its retracted position so that the brake shoes 32 are in non-locking relation with respect to the hub I5a of the hand wheel I5, it will readily be understood, in view of the detailed description hereinbefore stated, that the hand wheel I5 may be rotated in a desired direction to move the carriage 6 as desired along the tracks 4; Alternatively, if desired, movement of the carriage 6 may be effected by rotation of the hand wheel 'I I 3, Figs. 2 and 5, whereby the'gear wheel II-I rides along the fixed rack member' IIO to produce the desired movement of said carriage 6.

Assuming that the hand wheel 30 remains in its retracted position as described above, the hand wheel 28 may be rotated in one direction or the other to thereby effect desired movement of the arc lamp housing with respect to the carriage 6.

Assuming that the hand wheel 30 is in its advanced position so that the brake shoes 32 are in clutching relation with respect to the hub I5a of the hand wheel l5, it results that the two wheels I5 and 28 are connected together and that they are movable only as a unit. Under these conditions, therefore, it will be understood that either wheel I5 or 28' may be rotated and that such rotation effects movement of the carriage 6. During such movement of the carriage 6, the arc lamp housing moves therewith but does not move with respect thereto.

While the operator stands on the bench I63, it is obvious that the hand wheel 56 may be rotated in either direction so as to thereby rotate the shaft 54 which, by the chain 69, imparts rotative movement to the shaft II, the latter serving to move the support I3, the standards I4 and the thereby-carried objective lens 85 along the tracks 6a, 6a either toward or from the press a plate on the plate I56. Alternatively, if desired, the housing 8| may be elevated to release the latch 80 whereupon the hand wheel I8, Fig. 3, may be rotated in one direction or the other to thereby effect the same focusing action on the objective lens 85.

In view of the previous description, it will beunderstood that the handle 35 may be actuated to thereby move the shaft 34 into binding relation with respect to the sleeve I2. This arrangement is provided so that the sleeve I2 may be releasably locked in a desired position when it becomes desirable to prevent any forward or backward movement of the carriage 6.

It will also be understood that the handle 62a may be actuated to thereby move the shaft 62 into locking engagement with respect to the shaft 54. This arrangement is thus utilized when it becomes desirable to prevent movement of the objective lens 85 from a selected position.

As hereinbefore described, it will be understood that the shaft I I9, Fig. 1, may be actuated whenit becomes desirable to move the condenser lens assembly either toward or from the printing plate I09.

It will also be understood that the wheels I28 and II are provided so that the condenser lens assembly and the arc lamp housing may positively be locked on the carriage 6. The wheel I32 is provided so that the carriage 6 may be secured in immovable manner with respect to its supporting track structure.

As hereinbefore described in detail, the mechanism of my invention comprises various counter mechanisms, indexes, etc. whereby the extent of movement of relatively fixed and movable members with respect to each other may be determined or ascertained in the necessary accurate way as required by the art.

From the foregoing, it will be understood that, by my invention there is a desired centralization of controls in the immediate vicinity of the bench I63. Accordingly, the operator, without moving from'his position, may readily and quickly efl'ect those adjustments which are necessary before proceeding with a projecting operation.

As is usual in connection with projection apparatus for producing photographic reproductions, it will be understood that the projecting light beam is produced in the upper arc lamp housing and that such light beam passes from left to right, Fig. 1, from the arc lamp, through the condenser lens assembly, through the printing plate I09 and thence to the objective lens 85 (the space between the printing plate and the objective lens being unobstructed so that the light beam may readily pass along its intended path). From the objective lens, said projecting light beam passes toward and into engagement with the sensitized plate or the plate I56.

While the invention has been described with respect to a certain particular preferred example which gives satisfactory results, it will be understood by those skilled in the art after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended therefore in the appended claims to cover all such changes and modifications.

What is claimed as new and desired to be secured by Letters Patent is:

1. In apparatus of the character described, a trackway. .a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a holder for a sensitized surface, control means positioned immediately adjacent said holder, said control means comprising a shaft arrangement extending transversely with respect to said trackway, and operating devices extending longitudinally ofsaid trackway from said shaft arrangement to said carriage and said support, respectively.

2. In apparatus of the character described, a trackway, a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a holder for a sensitized surface, a first control means positioned immediately adjacent said holder, said control means comprising a shaft arrangement extending transversely with respect to said trackway, operating devices extending longitudinally of said trackway from said shaft arrangement to said carriage and said support respectively, and a second control means spaced from said first control means and positioned along the side of said trackway, said second control means comprising an operating shaft extending transversely with respect to said trackway for moving said carriage independently of said first control means.

3. In apparatus of the character described, a trackway, a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a holder for a sensitized surface, control means positioned immediately adjacent said holder, said control means comprising a shaft and sleeve arrangement having a common axis extending transversely with respect to said trackway, and operating devices extending longitudinally of said trackway from said shaft and sleeve arrangement to said carriage and said support, respectively.

4. In apparatus of the character described, a trackway, a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a holder for a sensitized surface, control means positioned immediately adjacent said holder, said control means comprising a shaft and sleeve arrangement having acommon axis extending transversely with respect to said trackway, a flexible element extending longitudinally of said trackway for connecting said shaft to said support, and another flexible element extending longitudinally of said trackway for connecting said sleeve I to said carriage.

5. In apparatus of the character described, a trackway, a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a holder for a sensitized surface, control means positioned 7 'trackway, a carriage movable on said trackway,

means for moving said carriage back and forth along said trackway, a support for an objective lens movable on said carriage, a holder for a sensitized surface, control means positioned immediately adjacent said holder to effect movement of said support on said carriage, said control means comprising a rotatable shaft mounted in a fixed position and said movable carriage being slidably related thereto, and means whereby power is transmitted from said shaft to said support.

7. In apparatus of the character described, a trackway, a carriage movable on said trackway, means for moving said carriage back and forth along said trackway, a support for an objective lens movable on said carriage, a holder for a sensitized surface, control means positioned immediately adjacent said holder to effect movement of said support on said carriage, said con trol means comprising a rotatable shaft mounted in a fixed position, a gear wheel carried by said movable carriage and slidably related to said rotatable shaft, and means whereby power is transmitted from said shaft to said support.

8. In apparatus of the character described, a trackway, a carriage movable on said trackway, a support for an objective lens movable on said carriage, a holder for a sensitized surface,

control means positioned immediately adjacent said holder to effect movement of said support on said carriage, said control means comprising a rotatable shaft mounted in a fixed position, a gear wheel carried by said movable carriage and slidably related to said rotatable shaft, a second shaft cooperative with said support, a gear wheel fixed to said second shaft, and a sprocket chain cooperative with said gear wheels.

9. In apparatus of the character described, a

.trackway, a carriage movable on said trackway,

a support for an objective lens movable on said carriage, a holder for a sensitized surface, a first control means positioned immediately adjacent said holder to effect movement of said supp rt on said carriage, said control means comprising a shaft cooperative with said support, gear means for rotating said shaft, and a second control means spaced from said first named control means, said second control means comprising an operating shaft disposed transversely of said first shaft and geared thereto.

10. In apparatus of the, character described, a trackway, a carriage movable longitudinally along said trackway, a support for an arc lamp movable longitudinally along said carriage, a support for an objective lens movable longitudinally along said carriage, a holder for a sensitized surface, control means comprising separate wheels for moving said carriage along said trackway and for moving said first named and said second named supports along said carriage, said wheels being positioned closely adjacent said holder'and at least one of said Wheels facing said holder, and a wheel facing said last named wheel formoving said holder transversely with respect to the path of said carriage, said first named wheels on the mm'r B. MUELLER. 

